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Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
Jürgen Uhlenbusch
Fusion Science and Technology | Volume 33 | Number 2 | March 1998 | Pages 345-354
Diagnostics | doi.org/10.13182/FST98-A11947027
Articles are hosted by Taylor and Francis Online.
The objective of laser-aided edge diagnostics is closely connected with plasma wall interaction processes. Thus at first a short description of the plasma regions near first wall, limiter or divertor and the most important quantities and processes to be evaluated there is given. A very important technique to measure electron densities and temperatures in the edge is Thomson scattering. Collective scattering represents a useful method to quantify fluctuations of electron density and their relation to particle and energy transport. To detect neutral particles and ions after their release from the wall and during recycling phases laser induced fluorescence (LIF) is a well established technique. Future applications of laser diagnostics as two-photon scattering and coherent anti-Stokes Raman scattering (CARS) are discussed.
IV. SUMMARY AND CONCLUSION
The most important methods of laser aided edge diagnostics are introduced and a few results of measurements summarized. While Thomson scattering on tokamaks seems to be now a matter of routine with high reliability, LIF techniques still underly restrictions because nearly each atomic species requires its own laser system, often in the VUV. Nevertheless, some progress can be observed with respect to the bandwidth, timing range, wavelength, power, reproducibility, repetition rate etc. It is anticipated that excitation by two-photon absorption develops more and more to a sensitive technique as this is expected from four-wave mixing techniques.